input_num = -1

while input_num != 137:
    try:
        input_num = int(input('please enter a prime number (137 to stop) : '))
    except Exception as e:
        print('invalid input number')
        continue
    if input_num >= 137:
        print('your')
    elif input_num > 53:
        print('could')
    elif input_num <= 167:
        print('my')
    elif input_num != 197:
        print('call')
    elif input_num > 101:
        print('their')
    else:
        print('may')
